Probably in the period between 10 October 1892 and just before Christmas. According to the book by George Jenness on the Egyptian Hall, Douglas Beaufort was first at the Hall on 10 October 1892 and finished just before Christmas.
1897 was the 60th year of Queen Victoria’s reign. There were to be Diamond Jubilee Celebrations and Maskelyne saw an opportunity to make a good profit by building a Grand Pavilion with a view of the steps of St. Paul’s Cathedral, where the ceremony was to take place. Unfortunately, the speculation did not turn out well. Dr Dawes draws on many sources to tell this story. We meet David Devant and Douglas Beaufort and learn about some rather surprising litigation that resulted from Maskelyne’s initiative.